<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:"Courier New";
mso-fareast-language:DE-CH;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="DE-CH" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">Dear colleagues<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">The absolute IGS antenna correction file (igs20_wwww.atx) has been updated.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">The new release is called 'igs20_2274.atx'. It contains the following<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">changes:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">1) According to NANU 2023042 , BLOCK IIR-A satellite SVN44 (2000-040A) will approximately on 10. August 2023 resume transmitting
utilizing PRN 22.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"> Therefore, the following satellite has been added to the igs20.atx starting from 10. August 2023:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">G22 (044): 10. August 2023 00:00:00<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">NANU 2023042:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2023042 NANU TYPE: GENERAL<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">*** GENERAL MESSAGE TO ALL GPS USERS ***<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">On approximately 14 AUG 2023, SVN44 will resume transmitting L-band utilizing PRN22.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">On 10 AUG 2023, GPS will transition SVN44 (PRN22) into the broadcast almanac for all satellites. The almanac transition, accomplished
one satellite at a time, will require approximately 24 hours to complete. Before, during, and after transition SVN44 (PRN22) will remain unusable until further notice. Future NANUs will notify users of any changes to the above stated status.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">*** GENERAL MESSAGE TO ALL GPS USERS ***<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"> POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTPS://WWW.NAVCEN.USCG.GOV<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"> MILITARY - GPS WARFIGHTER COLLABORATION CELL at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"> COMM 719-567-2541, gpsoperationscenter@us.af.mil, HTTPS://GPS.AFSPC.AF.MIL
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"> MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3526. COMM 805-606-3526.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">
<a href="mailto:JSPOCCOMBATOPS@US.AF.MIL">JSPOCCOMBATOPS@US.AF.MIL</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH">2) BLOCK IIR-A satellite SVN41 (2000-071A) has stopped transmitting on 7. August 2023. The following decommission date has
been added: <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"> G22 (G041): 7. August 2023 23:59:59<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black">The updated antenna correction model is available at<o:p></o:p></span></pre>
<pre><span class="MsoHyperlink"><o:p><span style="text-decoration:none"> </span></o:p></span></pre>
<pre><span class="MsoHyperlink"><span lang="EN-US" style="font-family:"Arial",sans-serif"><a href="https://files.igs.org/pub/station/general/igs20_2274.atx">https://files.igs.org/pub/station/general/igs20_2274.atx</a> </span></span><span class="MsoHyperlink"><span style="font-family:"Arial",sans-serif"><o:p></o:p></span></span></pre>
<pre><span class="MsoHyperlink"><span lang="EN-US" style="font-family:"Arial",sans-serif"><o:p><span style="text-decoration:none"> </span></o:p></span></span></pre>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black">and</span><span class="MsoHyperlink"><o:p></o:p></span></pre>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></pre>
<pre><span style="font-family:"Arial",sans-serif;color:black"><a href="https://files.igs.org/pub/station/general/igs20.atx"><span lang="EN-US">https://files.igs.org/pub/station/general/igs20.atx</span></a></span><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></pre>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black">With best regards,<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black">Arturo Villiger<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black">(<a href="mailto:arturo.villiger@swisstopo.ch">arturo.villiger@swisstopo.ch</a>)<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="font-family:"Arial",sans-serif;color:black">on behalf of the IGS Antenna Working Group<o:p></o:p></span></pre>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
</div>
</body>
</html>